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Accounts Receivable and Contract Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Accounts Receivable and Contract Assets [Abstract]    
Accounts receivable - customers $ 5,392 $ 4,574
Other receivables 278 152
Accounts receivable 5,670 4,726
Less: allowance for doubtful accounts (477) (305)
Accounts receivable, net 5,193 4,421
Unbilled revenue 2,801 $ 2,276
Change in accounts receivable - customers 818  
Change in other receivables 126  
Change in accounts receivable 944  
Change in allowance for doubtful accounts (172)  
Change in accounts receivable, net 772  
Change in unbilled revenue $ 525